From: Benjamin Barenblat <bbaren@google.com>
Subject: Disable SysinfoTest.NominalCPUFrequency on armel/armhf

NominalCPUFrequency has different behavior on 32-bit and 64-bit ARM
kernels. The Debian arm64 buildds assume they can build 32-bit ARM
packages, but if they do, the NominalCPUFrequency test will fail.
Disable the test when building for 32-bit ARM.

--- a/absl/base/internal/sysinfo_test.cc
+++ b/absl/base/internal/sysinfo_test.cc
@@ -43,7 +43,13 @@
 // POWER is particularly problematic here; some Linux kernels expose the CPU
 // frequency, while others do not. Since we can't predict a priori what a given
 // machine is going to do, just disable this test on POWER on Linux.
+//
+// Debian also disables this test on armel and armhf, since tests for those
+// platforms could either be run on a 32-bit ARM system (where
+// NominalCPUFrequency returns a reasonable value) or a 64-bit ARM system (where
+// it does not).
-#if !(defined(__linux) && (defined(__ppc64__) || defined(__PPC64__)))
+#if !(defined(__linux) && \
+      (defined(__ppc64__) || defined(__PPC64__) || defined(__arm__)))
 TEST(SysinfoTest, NominalCPUFrequency) {
   // Linux only exposes the CPU frequency on certain architectures, and
   // Emscripten doesn't expose it at all.